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tracing: Inject seq_print_userip_objs() into its only user 

seq_print_userip_objs() is used only in one location, in one file. Instead
of having it as an external function, go one further than making it static,
but inject is code into its only user. It doesn't make the calling function
much more complex.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-09-28 10:11:44 -04:00 committed by Steven Rostedt
parent ca475e831f
commit 6b1032d53c
2 changed files with 36 additions and 47 deletions
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81
kernel/trace/trace_output.c
View File

@ -354,50 +354,6 @@ int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
return !trace_seq_has_overflowed(s);
}
int
seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
unsigned long sym_flags)
{
struct mm_struct *mm = NULL;
unsigned int i;
if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
struct task_struct *task;
/*
* we do the lookup on the thread group leader,
* since individual threads might have already quit!
*/
rcu_read_lock();
task = find_task_by_vpid(entry->tgid);
if (task)
mm = get_task_mm(task);
rcu_read_unlock();
}
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
unsigned long ip = entry->caller[i];
if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
break;
trace_seq_puts(s, " => ");
if (!ip) {
trace_seq_puts(s, "??");
trace_seq_putc(s, '\n');
continue;
}
seq_print_user_ip(s, mm, ip, sym_flags);
trace_seq_putc(s, '\n');
}
if (mm)
mmput(mm);
return !trace_seq_has_overflowed(s);
}
int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
{
@ -1081,11 +1037,46 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
{
struct userstack_entry *field;
struct trace_seq *s = &iter->seq;
struct mm_struct *mm = NULL;
unsigned int i;
trace_assign_type(field, iter->ent);
trace_seq_puts(s, "<user stack trace>\n");
seq_print_userip_objs(field, s, flags);
if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
struct task_struct *task;
/*
* we do the lookup on the thread group leader,
* since individual threads might have already quit!
*/
rcu_read_lock();
task = find_task_by_vpid(field->tgid);
if (task)
mm = get_task_mm(task);
rcu_read_unlock();
}
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
unsigned long ip = field->caller[i];
if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
break;
trace_seq_puts(s, " => ");
if (!ip) {
trace_seq_puts(s, "??");
trace_seq_putc(s, '\n');
continue;
}
seq_print_user_ip(s, mm, ip, flags);
trace_seq_putc(s, '\n');
}
if (mm)
mmput(mm);
return trace_handle_return(s);
}

2
kernel/trace/trace_output.h
View File

@ -14,8 +14,6 @@ trace_print_printk_msg_only(struct trace_iterator *iter);
extern int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
unsigned long sym_flags);
extern int seq_print_userip_objs(const struct userstack_entry *entry,
struct trace_seq *s, unsigned long sym_flags);
extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
unsigned long ip, unsigned long sym_flags);